How to Replace an exe or DLL That Is In Use — Restart Manager and the "File In Use" Problem in Auto-Update (archived 2026-08-30)

Q: What does this research mean for the field?

Executable files and DLLs that are locked while in use can be successfully replaced during auto-updates by leveraging the Windows Restart Manager, rename-then-replace techniques, and replace-on-reboot commands. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Go Komura

doi:10.5281/zenodo.22170744

August 30, 2026Open Access

How to Replace an exe or DLL That Is In Use — Restart Manager and the "File In Use" Problem in Auto-Update (archived 2026-08-30)

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Key Points

To determine why active executable and DLL files cannot be directly overwritten during software updates and evaluate mechanisms for safely replacing locked files.
Analyzed Windows file-locking behavior and renaming permissions on running executable (exe) and dynamic-link library (DLL) files.
Developed diagnostic C# code to interface with the Windows Restart Manager API for enumerating, shutting down, and restarting processes that hold active file locks.
Evaluated filesystem-level update workarounds including rename-then-replace procedures and delayed updates via the MoveFileEx system call.
Running executable files maintain active file locks that reject direct overwrites, but filesystem semantics allow running files to be renamed.
Windows Restart Manager successfully identifies process dependencies holding locked files and automates process shutdown and post-update resumption.
The MoveFileEx API offers a reliable fallback strategy by queuing file replacement operations to complete during subsequent operating system reboots.

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Implication

Technical analysis demonstrates methods for replacing locked executables during application updates, highlighting process termination via Restart Manager and file renaming strategies.

Abstract

Why can't an exe or DLL that is in use be replaced? This article covers the locking of running files and the fact that renaming is still allowed, enumerating, shutting down and restarting the processes holding a file with Restart Manager, and rename-then-replace and MoveFileEx's replace-on-reboot — with C# diagnostic code. Archived version of https://comcomponent.com/en/blog/restart-manager-file-in-use-update-guide/, as published on 2026-08-30. The live article is maintained and may change after this date. First published 2026-07-24.

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Go Komura (2026) studied this question.

synapsesocial.com/papers/6a95427bf20e493292a74df1 https://doi.org/10.5281/zenodo.22170744

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How to Replace an exe or DLL That Is In Use — Restart Manager and the "File In Use" Problem in Auto-Update (archived 2026-08-30)

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How to Replace an exe or DLL That Is In Use — Restart Manager and the "File In Use" Problem in Auto-Update (archived 2026-08-30)

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